:root {
  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;

  color-scheme: light dark;
  color: #213547;
  background-color: #ffffff;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html.dark {
  color: rgba(255, 255, 255, 0.87);
  background-color: #242424;
}

a {
  font-weight: 500;
  color: #646cff;
  text-decoration: inherit;
}
a:hover {
  color: #535bf2;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background-color: #f5f7fa;
}

h1 {
  font-size: 3.2em;
  line-height: 1.1;
}

button {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.6em 1.2em;
  font-size: 1em;
  font-weight: 500;
  font-family: inherit;
  background-color: #1a1a1a;
  cursor: pointer;
  transition: border-color 0.25s;
}
button:hover {
  border-color: #646cff;
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}

.card {
  padding: 2em;
}

#app {
  margin: 0 auto;
}

@media (prefers-color-scheme: light) {
  :root {
    color: #213547;
    background-color: #ffffff;
  }
  a:hover {
    color: #747bff;
  }
  button {
    background-color: #f9f9f9;
  }
}

/* 确保未经历的人生年份有足够的对比度 */
.life-cell {
  border: 1px solid #dcdfe6;
  color: #303133;
  background-color: #f5f7fa;
}

.life-cell.past {
  background-color: #67c23a;
  color: #ffffff;
}

.life-cell.current {
  background-color: #409eff;
  color: #ffffff;
}

html.dark .life-cell {
  border: 1px solid #4c4d4f;
  color: #e5eaf3;
  background-color: #1d1e1f;
}

html.dark .life-cell.past {
  background-color: #529b2e;
  color: #ffffff;
}

html.dark .life-cell.current {
  background-color: #337ecc;
  color: #ffffff;
}
